Note:This product can only be used on 12V car electrical system. Features: Red clip link back-up battery positive, negative black negative. Prevents electronic memory loss when disconnecting a vehicle's battery preserves vehicle codes and electronic presets. You can use this car data saver to keep your car's computer powered through the OBDII port or the cigarette lighter socket on the car while you replace the car's storage battery. The car data saver needs an additional 12V storage battery as a temporary power source. It is a very useful tool for car service. The emergency power interface with super long 6.5 ft (2meters) cable. In this way, you can change your car battery, also by get the alternative 12V power source from another car, when you not have a jump starter on hand. As our device with 2 meter cable, it will be a convenient way, should you not have jump starter (or Lead-acid battery) on hand, and the device can also get the 12v power supply from cigarette lighter of another good car. Just insert the Cigarette lighter plug to this car and insert into 16 pin plug to the OBD port of the car you want to replace battery. Great for keeping the computer memory alive while working on the car. Many repairs need to disconnect the battery and this connected to an external power source. Specifications: Color: black Wire core material: copper Package size: 24.5 * 10 * 4cm Package weight: 260g Tips: 1.If both the two LEDs on the Car Data Saver lights green, the charge level of this storage battery is high enough. 2.If a LED on the Car Data Saver lights green and another LED lights red, this storage battery is not high enough and needs to be charged before it can be used as a temporary power source, or you can use another 12V storage battery which is high enough as a temporary power source. 3.Disconnect the car's storage battery ( which is to be replaced ) from the car while remaining the connection between the car and the Car Data Saver, which is with the storage battery of temporary power source. Then connect a storage battery to the car, make sure that the polarity connections are correct. 4.Disconnect the Car Data Saver from the car. Then disconnect the Car Data Saver from the storage battery of temporary power source. Package List: 1 * Car Memory Data Saver Set